Andrew Nesbitt 7346008aa5 Add metadata TTL and stale-while-revalidate support ... Cached metadata is now served directly within a configurable TTL window (default 5m) without contacting upstream, reducing latency and upstream load. When upstream is unreachable and the cache is past its TTL, stale content is served with a Warning: 110 header per RFC 7234. New config: `metadata_ttl` (YAML) / `PROXY_METADATA_TTL` (env). Set to "0" to always revalidate with upstream.		2026-04-13 09:01:05 +01:00
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main.go	Add metadata TTL and stale-while-revalidate support	2026-04-13 09:01:05 +01:00